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Cell viability of HeLa cells after treatment with free DOX, DOX-loaded Si/SF nanospheres (Si/SF-DOX), and DOX-loaded Si/SS nanofibers (Si/SS-DOX) at varied DOX concentrations and cultured 1, 2, 3, and 5 days. The concentration of DOX treatment was set at (A) 2, (B) 1, (C) 0.5, and (D) 0.2 μg/mL.
